Publications
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Statistical analysis of soil geochemical data to identify pathfinders associated with mineral deposits: An example from the Coles Hill uranium deposit, Virginia, USA Statistical analysis of soil geochemical data to identify pathfinders associated with mineral deposits: An example from the Coles Hill uranium deposit, Virginia, USA
Soil geochemical anomalies can be used to identify pathfinders in exploration for ore deposits. In this study, compositional data analysis is used with multivariate statistical methods to analyse soil geochemical data collected from the Coles Hill uranium deposit, Virginia, USA, to identify pathfinders associated with this deposit. Elemental compositions and relationships were compared...
Authors
Denise M. Levitan, Carl E. Zipper, Patricia Donovan, Madeline E. Schreiber, Robert R. Seal, Mark A. Engle, John A. Chermak, Robert J. Bodnar, Daniel K. Johnson, Joseph G. Aylor
Evaluating the relationship between biomass, percent groundcover and remote sensing indices across six winter cover crop fields in Maryland, United States Evaluating the relationship between biomass, percent groundcover and remote sensing indices across six winter cover crop fields in Maryland, United States
Winter cover crops are an essential part of managing nutrient and sediment losses from agricultural lands. Cover crops lessen sedimentation by reducing erosion, and the accumulation of nitrogen in aboveground biomass results in reduced nutrient runoff. Winter cover crops are planted in the fall and are usually terminated in early spring, making them susceptible to senescence, frost burn...
Authors
Kusuma Prabhakara, W. Dean Hively, Greg W. McCarty
Water's Way at Sleepers River watershed – revisiting flow generation in a post-glacial landscape, Vermont USA Water's Way at Sleepers River watershed – revisiting flow generation in a post-glacial landscape, Vermont USA
The Sleepers River Research Watershed (SRRW) in Vermont, USA, has been the site of active hydrologic research since 1959 and was the setting where Dunne and Black demonstrated the importance and controls of saturation-excess overland flow (SOF) on streamflow generation. Here, we review the early studies from the SRRW and show how they guided our conceptual approach to hydrologic research...
Authors
James B. Shanley, Stephen D. Sebestyen, Jeffrey J. McDonnell, Brian L. McGlynn, Thomas Dunne
Sea level and turbidity controls on mangrove soil surface elevation change Sea level and turbidity controls on mangrove soil surface elevation change
Increases in sea level are a threat to seaward fringing mangrove forests if levels of inundation exceed the physiological tolerance of the trees; however, tidal wetlands can keep pace with sea level rise if soil surface elevations can increase at the same pace as sea level rise. Sediment accretion on the soil surface and belowground production of roots are proposed to increase with...
Authors
Catherine E. Lovelock, Maria Fernanda Adame, Vicki Bennion, Matthew Hayes, Ruth Reef, Nadia Santini, Donald R. Cahoon
The distribution of selected elements and minerals in soil of the conterminous United States The distribution of selected elements and minerals in soil of the conterminous United States
In 2007, the U.S. Geological Survey initiated a low-density (1 site per 1600 km2, 4857 sites) geochemical and mineralogical survey of soil of the conterminous United States as part of the North American Soil Geochemical Landscapes Project. Three soil samples were collected, if possible, from each site; (1) a sample from a depth of 0 to 5 cm, (2) a composite of the soil A-horizon, and (3)...
Authors
Laurel G. Woodruff, William F. Cannon, David B. Smith, Federico Solano
NACSN, note 67--Application for revision of Articles 36 and 37, Lithodemic units of the North American stratigraphic code NACSN, note 67--Application for revision of Articles 36 and 37, Lithodemic units of the North American stratigraphic code
Currently the North American Stratigraphic Code, (NACSN 2005, Article 37) sets restrictions on the use of the term “complex” for lithodemic units. With exceptions for “volcanic complex” and “structural complex,” a complex must consist of more than one genetic class of rock (i.e., sedimentary, igneous or metamorphic). Thus, the use of the term “complex” to describe masses of intrusive...
Authors
Robert M. Easton, Lucy E. Edwards, Randall C. Orndorff, Manuel Duguet, Ismael Ferrusquia-Villafranca
Use of structured decision making to identify monitoring variables and management priorities for salt marsh ecosystems Use of structured decision making to identify monitoring variables and management priorities for salt marsh ecosystems
Most salt marshes in the USA have been degraded by human activities, and coastal managers are faced with complex choices among possible actions to restore or enhance ecosystem integrity. We applied structured decision making (SDM) to guide selection of monitoring variables and management priorities for salt marshes within the National Wildlife Refuge System in the northeastern USA. In...
Authors
Hilary A. Neckles, James E. Lyons, Glenn R. Guntenspergen, W. Gregory Shriver, Susan C. Adamowicz
Methods used to parameterize the spatially-explicit components of a state-and-transition simulation model Methods used to parameterize the spatially-explicit components of a state-and-transition simulation model
Spatially-explicit state-and-transition simulation models of land use and land cover (LULC) increase our ability to assess regional landscape characteristics and associated carbon dynamics across multiple scenarios. By characterizing appropriate spatial attributes such as forest age and land-use distribution, a state-and-transition model can more effectively simulate the pattern and...
Authors
Rachel Sleeter, William Acevedo, Christopher E. Soulard, Benjamin M. Sleeter